[Sneap] HVEC GVM Motor Bearings

[Thomas A Brown]

Hi Chris,

   We use Barden high precision bearings (PN: 38FFTX79K   G-42).  We 
originally put these into the UW NPL GVM when I was there doing AMS, 
and started using them here at CAMS when we first had a bearing 
failure here several years ago.  The seem to be doing well at both 
locations (although I don't know if Carl/Greg have since gone to 
other bearings at UW).

   We got the high precision bearings at UW after we found that we 
were seeing a lot of rotational frequency noise in the GVM signal (58 
Hz fundamental, if I remember correctly).  This noise was 
significantly reduced when we rebuilt the motor with the Barden 
bearings - I think they were important, but the rebuild itself may 
have helped alot.

   I would be very interested to hear what alternatives you find 
(especially if you think a different type is better than the Barden 
bearings).

Have fun.
Tom.


>The ATF-SNEAP 2006 meeting was held in Australia and information is 
>available at:
>http://www.ansto.gov.au/nugeo/conference/private/ATF_SNEAP.htm
>
>++++++++++++++++++++++++++++++++++++
>
>The SNEAP 2007 meeting will be hosted by Brigham Young University in 
>Salt Lake City Utah. The meeting web site is located at:
>http://webpub.byu.net/wsd/.
>
>I would like to know what people are using for replacement bearings 
>in their HVEC 4-Blade GVM motors?
>We have found a couple different types in ours. One is an obsolete 
>part number and the second
>we have not been able to source.
>Regards,
>- Chris
>--
>
>Chris R. Westerfeldt
>Research Scientist / T.U.N.L. Radiation Safety Manager
>Duke University Physics Department &
>Triangle Universities Nuclear Laboratory
>Science Drive, Box 90308
>Durham, NC  27708-0308
>Tel: (919) 660-2600        
>Fax: (919) 660-2634
>Email: Cwest at Tunl.Duke.Edu
>
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-- 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dr. Tom Brown
Center for Accelerator Mass Spectrometry
LLNL L-397		email: tabrown at llnl.gov
PO BOX 808		phone: (925)423-8507
7000 East Avenue		fax: (925)423-7884
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